1 /* 2 * Copyright 2015 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef GrNonAtomicRef_DEFINED 9 #define GrNonAtomicRef_DEFINED 10 11 #include "SkRefCnt.h" 12 #include "SkTArray.h" 13 14 /** 15 * A simple non-atomic ref used in the GrBackend when we don't want to pay for the overhead of a 16 * threadsafe ref counted object 17 */ 18 template<typename TSubclass> class GrNonAtomicRef : public SkNoncopyable { 19 public: GrNonAtomicRef()20 GrNonAtomicRef() : fRefCnt(1) {} 21 22 #ifdef SK_DEBUG ~GrNonAtomicRef()23 ~GrNonAtomicRef() { 24 // fRefCnt can be one when a subclass is created statically 25 SkASSERT((0 == fRefCnt || 1 == fRefCnt)); 26 // Set to invalid values. 27 fRefCnt = -10; 28 } 29 #endif 30 unique()31 bool unique() const { return 1 == fRefCnt; } 32 ref()33 void ref() const { 34 // Once the ref cnt reaches zero it should never be ref'ed again. 35 SkASSERT(fRefCnt > 0); 36 ++fRefCnt; 37 } 38 unref()39 void unref() const { 40 SkASSERT(fRefCnt > 0); 41 --fRefCnt; 42 if (0 == fRefCnt) { 43 GrTDeleteNonAtomicRef(static_cast<const TSubclass*>(this)); 44 return; 45 } 46 } 47 48 private: 49 mutable int32_t fRefCnt; 50 51 typedef SkNoncopyable INHERITED; 52 }; 53 GrTDeleteNonAtomicRef(const T * ref)54template<typename T> inline void GrTDeleteNonAtomicRef(const T* ref) { 55 delete ref; 56 } 57 58 #endif 59